An acronym that stands for Best Friends For Life With Benefits.
It is used to describe two people, who don't go out but are so close that everyone around them thinks they are together.
Therefore, they may mack on occasionly, BFFL with benefits.
(Used in the same format with the acronyms; BFFL, BFF etc)
Person 1 "Are Matt and Millie dating?"
Person 2 "Nah, Matt says they are just really close friends."
Person 1 "Bit too close if you ask me. BFFLWB ey? Ey?"
Person 2 "Haha definitelygetting some action on the side."
(BIFF-EL): Best Friends For Life Eternally.
A platonic friendship between a boy and girl to show the multitude a family love for one another until one is married given the other the opportunity to select a new BFFLE.